单项选择题
A pressure drop through the refrigerant liquid line may cause （）.
A.solenoid valve to seize
B.compressor to hunt
C.formation of flash gas in the liquid line
D.expansion valve to freeze open
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相关考题
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单项选择题
Low compressor head pressure in a refrigeration system can be caused by（）.
A.insufficient condenser cooling water
B.excessive condenser cooling water
C.air in the refrigeration system
D.excessive refrigerant in the system -
单项选择题
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
A.Thermal expansion valve frozen open
B.Suction gas heat exchanger bypassed
C.Condenser clogged or fouled
D.High pressure cutout switch inoperative -
单项选择题
The usual symptoms of cavitation in a centrifugal pump is （）.
A.noise and vibration
B.an increase in discharge pressure
C.an increase in suction pressure
D.lifting of the relief valve
